Manitowoc GROVE RT890E Operator's Manual page 51

RT890E
CAUTION
Should the crane become mired down, use a tow truck or
tractor to free the vehicle. Severe damage to the
transmission or axles may occur if the operator attempts
to free the crane unassisted.
CAUTION
If the crane is mired down, use the tow/tie-down lugs to
pull or tow.
There are two tow/tie-down lugs installed on each end of the
crane. Use both lugs to tow or pull the crane.
Extended Travel
Depending upon the tire manufacturer, the higher inflation
pressures normally specified for lifting on rubber are not
recommended for site to site transfer over extended
distances. The higher static/creep 8 km/h (5 mph) inflation
pressures may remain in the tire while operating the crane
on site within a distance of less than 6.4 km (4 miles).
CAUTION
For extended travel, check the cold tire pressure prior to
start. (Refer to tire inflation chart in load chart book.) After
every one hour of travel time, regardless of ambient
temperature, stop and allow the tires to cool off for at least
30 minutes. At the destination, the tires must be allowed
to cool to ambient temperature before crane lifting on
rubber.
Moving the Crane
The following superstructure conditions should be strictly
adhered to before moving the crane. Procedures for
accomplishing the following can be found in the various
sections of this manual.
1. Fully retract the boom.
2. Ensure the swingaway jib is properly stowed and
secured.
3. Swing the boom to over-the-front and lower it to slightly
above horizontal.
4. Turn the SWING BRAKE switch on the front console to
ON and engage the swing lock pin by turning the handle.
OPERATING CONTROLS AND PROCEDURES
5. Remove the hook block and/or headache ball from the
hoist cable(s) and stow securely before traveling or
make sure the hook block or headache ball is properly
secured to the tie down provided for that purpose.
6. Fully retract the outrigger stabilizers and remove the
floats.
7. Properly store the floats.
Steering
Steering is accomplished by the steering wheel and the rear
steer control. These controls, used singly or together,
provide front wheel steering, rear wheel steering, four-wheel
steering, and crabbing capabilities.
Front Wheel Steering
Conventional front wheel steering is accomplished with the
steering wheel. This method of steering should always be
used when traveling at higher speeds.
O p e r a t e t h e r e a r s t e e r o n l y f o r a d d e d j o b s i t e
maneuverability.
Rear Wheel Steering
Rear wheel steering is controlled by the REAR STEER
control switch. Moving the control switch to the desired
position activates the rear steer cylinders, thereby steering
the crane in the selected direction.
Four Wheel Steering
Four wheel steering is accomplished with the steering wheel
and the REAR STEER control. Depending upon which
direction the operator wishes to travel, the steering wheel is
turned opposite direction of the REAR STEER control
position. This allows the crane to turn or maneuver in close,
restricted areas.
Crabbing
Crabbing is accomplished with the steering wheel and the
REAR STEER control switch. Depending upon which
direction the operator wishes to travel (crab), the steering
wheel is turned in the same direction as the REAR STEER
control switch. This permits driving the crane forward or
backward in a crabbing manner.
WARNING
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